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. 2016 May 5;11(5):e0154924. doi: 10.1371/journal.pone.0154924

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© 2016 Wang et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — MTT assay to assess proliferation of the MC-3T3-E1 cells after ES. 100 Hz group has the highest proliferation rate at days 1, 3 compared to the other frequency and control group. 1K Hz group showed similar proliferation compared to control group at days 1, 3. 1 Hz, 10 Hz, 10 KHz, and 100 KHz showed lower proliferation than control group at day 1. (P < 0.05, indicated statistically significant difference)